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Title: Pyriproxyfen  
Author: World Heritage Encyclopedia
Language: English
Subject: Insecticides, Insect growth regulator, Pyrethroid, Attractive toxic sugar baits, Empenthrin
Collection: Insecticides, Phenol Ethers, Pyridines
Publisher: World Heritage Encyclopedia


Chemical structure of pyriproxyfen
IUPAC names
4-phenoxyphenyl (RS)-2-(2-pyridyloxy)propyl ether
ATCvet code QP53
ChemSpider  Y
Jmol-3D images Image
Molar mass 321.369 g/mol
Density 1.2 g/cm3
Melting point 46 °C (115 °F; 319 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: Y/N?)

Pyriproxyfen is a pyridine-based pesticide which is found to be effective against a variety of arthropoda.[1] It was introduced to the US in 1996, to protect cotton crops against whitefly. It has also been found useful for protecting other crops. It is also used as a prevention for fleas on household pets.

Pyriproxyfen is a juvenile hormone analog, preventing larvae from developing into adulthood and thus rendering them unable to reproduce.

In the US, pyriproxyfen is often marketed under the trade name Nylar. In Europe, pyriproxyfen is known under the brand names Cyclio (Virbac) and Exil Flea Free TwinSpot (Emax).

See also

  • Methoprene
  • Methoprene in the Pesticide Properties DataBase (PPDB)
  • Pyriproxyfen in the Pesticide Properties DataBase (PPDB)


  1. ^ Ishaaya, I; Horowitz, AR (1995). "Pyriproxyfen, a Novel Insect Growth Regulator for Controlling Whiteflies : Mechanisms and Resistance Management". Pestic. Sci. 43 (3): 227–232.  

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